Shell



FIG. 1 is a front, top and left side perspective view of a shell showingour new design;

FIG. 2 is a front elevational view of the shell;

FIG. 3 is a rear elevational view of the shell;

FIG. 4 is a top plan view of the shell;

FIG. 5 is is a bottom plan view of the shell;

FIG. 6 is a left side elevational view of the shell; and,

FIG. 7 is a right side elevational view of the shell.

CLAIM The ornamental design for a shell, as shown and described.